Yes there's probably a reason why they use it. But apreciation of music is to a great end subjective, so i think experimenting is probably worth trying for everyone.

I have planned to experiment with different kinds of binaural beats severall times, but somehow i always manage to forget actually doing it once a psychedelic substance starts having an effect.

Another thought i had, is that brainwave interference could maybe help explain some synergies, like between cannabis and the classic entheogens. I don't know of any pharmacological mechanism that explains how cannabis can potentiate the effect of hallucinogens. All i can say is that there is an obvious overlap in effects. So there could be an overlap in the brainwaves they trigger. But if there is just an overlap and not a 100% equivalence, then maybe the interference of different brainwaves widens the whole spectrum of frequencies by adding up the higher ones.

In that case the ultra high gamma interference would mostly be responsible for the synergy, i think.